Pilot-adaptive-control-based large-flow unloading valve structure

Abstract

The present invention relates to a pilot-adaptive-control-based large-flow unloading valve structure, comprising: a main valve body (1), wherein two main valve seats (8) are provided at the inner top of the main valve body (1), a main valve core (10) is provided on each of the two main valve seats (8), two one-way valve guide sleeves (13) are provided at the inner bottom of the main valve body (1), a one-way valve core (12) is provided on each of the two one-way valve guide sleeves (13), and each one-way valve core (12) is arranged below the corresponding main valve core (10); a mechanical pilot valve (2), the mechanical pilot valve (2) being arranged at one end of the main valve body (1); and a solenoid pilot valve (4), the solenoid pilot valve (4) being arranged at the top of one side of the mechanical pilot valve (2). By means of the mutual coordination of four provided hydraulic paths, the long-term stable operation of a system is ensured, overload is prevented, the energy consumption is reduced, and the service life of a device is prolonged, thereby improving the response speed, stability and control precision of the system, and effectively improving the efficiency and reliability of the hydraulic system.

Description

A high-flow unloading valve structure based on pilot adaptive control Technical Field

[0001] This invention relates to the field of unloading valve technology, and in particular to a high-flow unloading valve structure based on pilot adaptive control. Background Technology

[0002] As a key hydraulic component in the pump station hydraulic system, the unloading valve's main function is to quickly unload the load from the hydraulic pump when the system pressure reaches a set value, preventing system overload and ensuring safe equipment operation. The stability of this component not only affects the normal operation of the hydraulic system but also directly impacts the overall pressure control, energy management, and response speed of the actuators in the pump station. If the unloading valve experiences sluggish action, leakage, or excessive pressure fluctuations during operation, it may lead to abnormal system pressure, thereby affecting the service life of the hydraulic pump, pipelines, and actuators, and even causing equipment failure. Therefore, the performance stability of the unloading valve is crucial. It needs to possess precise pressure control capabilities, rapid response characteristics, and good sealing performance to ensure that the pump station hydraulic system can operate efficiently and reliably under various working conditions.

[0003] In the prior art, Chinese patent document CN114877106A, concerning an unloading valve, proposes using a ball as a sealing element, changing the sealing method to a line seal. Line seals offer better sealing performance and are easier to manufacture. Using a ball as a sealing element, the force-bearing area of ​​the spherical convex surface is greater than that of the original planar valve core, effectively reducing the impact loss of high-pressure liquid media. Using a ball as a sealing element also provides an automatic guiding and positioning function, enabling automatic adjustment and reset to ensure reliable sealing. However, consistent with traditional methods, traditional unloading valves typically lack a dedicated hydraulic circuit to automatically maintain the pressure balance of the pilot valve core, resulting in pressure ripples. The valve core is prone to malfunction or delayed response, which affects the control accuracy and stability of the system, reduces the reaction speed of the hydraulic actuator, and lacks a dedicated return fluid path to guide the high-pressure fluid backflow. When the pressure reaches the preset threshold, it cannot quickly guide the fluid backflow, resulting in prolonged system overload time, increasing the risk of equipment damage and wasting energy. Furthermore, the unloading valve only uses a ball seal and spring reset, without a dedicated pressure balance control channel. When the hydraulic pressure fluctuates greatly, it may cause the valve core to open erroneously or close untimely. Therefore, this application discloses a high-flow unloading valve structure based on pilot adaptive control. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose a high-flow unloading valve structure based on pilot adaptive control to solve the problem of lacking a dedicated hydraulic circuit to automatically maintain the pressure balance of the pilot valve core.

[0005] To achieve the above objectives, the present invention provides a large flow unloading valve structure based on pilot adaptive control, comprising a main valve body, wherein two main valve seats are provided at the top of the main valve body, and a main valve core is provided on each of the two main valve seats; two one-way valve guide sleeves are provided at the bottom of the main valve body, and a one-way valve core is provided on each of the two one-way valve guide sleeves; the one-way valve core is located below the main valve core.

[0006] A mechanical pilot valve is disposed at one end of the main valve body and communicates with the main valve core through a fluid channel to control the opening and closing of the main valve core when the hydraulic system pressure rises. The mechanical pilot valve is provided with a pilot valve core inside.

[0007] An electromagnetic pilot valve is disposed on the top side of the mechanical pilot valve and communicates with the main valve core through a fluid channel to adjust the state of the main valve core under the control of an external electrical signal.

[0008] A pilot filter is disposed at the bottom of one side of the mechanical pilot valve. The pilot filter is used to filter the high-pressure liquid entering the electromagnetic pilot valve or the mechanical pilot valve to ensure stable system operation.

[0009] Preferably, two main valve springs are provided at the top of the main valve body, and the bottom ends of the two main valve springs are fixedly connected to one side of the main valve core. Two one-way valve springs are provided in the middle of the main valve body, and the other ends of the two one-way valve springs are respectively embedded in one side of the two one-way valve cores. Two main valve sleeves adapted to the main valve cores are provided on the top surface of the main valve body.

[0010] Preferably, one side of the main valve body is further provided with a high-pressure liquid supply channel, a pump discharge channel, and an unloading return channel. The high-pressure liquid supply channel is located at the bottom inside the main valve body and is positioned above the one-way valve guide sleeve 13. A high-pressure liquid supply port is provided on one side of the high-pressure liquid supply channel. The unloading return channel is located at the top inside the main valve body and is connected to the two main valve cores. An unloading return port is provided on one side of the unloading return channel. The pump discharge channel is positioned between the high-pressure liquid supply channel and the unloading return channel. A pump discharge port is provided on one side of the pump discharge channel.

[0011] Preferably, the pilot valve core includes a pilot valve plug disposed on one side of the mechanical pilot valve, a push rod guide sleeve disposed on one side of the pilot valve plug, a push rod slidably mounted inside the push rod guide sleeve, a pilot valve seat disposed on one side of the push rod guide sleeve, a first ceramic ball guide sleeve disposed on one side of the pilot valve seat, a ceramic ball disposed inside the first ceramic ball guide sleeve, a spring guide rod disposed on the other side of the mechanical pilot valve, second ceramic ball guide sleeves disposed on the upper and lower sides of the spring guide rod, a third ceramic ball guide sleeve disposed inside the two second ceramic ball guide sleeves, an adjusting screw sleeve disposed on the side of the main valve body away from the pilot valve plug, a set screw disposed on the internal thread of the adjusting screw sleeve, one side of the set screw abutting against the spring guide rod, an adjusting screw disposed on one side of the mechanical pilot valve, a set screw fixedly connected to one side of the set screw, and one side of the adjusting screw being configured as an internal hexagon.

[0012] Preferably, the sealing method of the first ceramic ball guide sleeve and the ceramic ball is set as a line seal.

[0013] Preferably, a first high-pressure pipe is provided on one side of the high-pressure liquid supply channel, the other end of the first high-pressure pipe is connected to the pilot valve core inside the mechanical pilot valve, and the first high-pressure pipe is located at the rear of the push rod.

[0014] Preferably, a second high-pressure pipe is provided on one side of the pump discharge channel. The second high-pressure pipe flows back to the pilot valve core through the pilot filter and is then connected to the main valve core. The second high-pressure pipe is first connected to the main valve core through the main valve sleeve.

[0015] Preferably, a third high-pressure pipe is provided on one side of the unloading return channel, and the other end of the third high-pressure pipe is connected to the rear of the pilot valve core. The diameters of the first high-pressure pipe, the second high-pressure pipe, and the third high-pressure pipe are all set to 3mm.

[0016] Preferably, a mechanical / electromagnetic switching knob is also provided on one side of the top of the electromagnetic pilot valve, which is used to switch between mechanical control and electromagnetic control.

[0017] The beneficial effects of this invention are:

[0018] 1. This high-flow unloading valve structure based on pilot adaptive control, through the coordinated operation of four hydraulic circuits, ensures the efficient operation of the hydraulic system under different working conditions. First, the main supply circuit provides stable pressure through a check valve to prevent backflow, improve supply efficiency and system stability. The hydraulic circuit controlling the push rod action automatically maintains the pressure balance of the pilot valve core through high-pressure liquid, preventing malfunctions or delayed response and enhancing the control accuracy of the system. The pressure holding control circuit keeps the main valve closed through high-pressure liquid, avoiding liquid loss caused by vibration or loosening, and ensuring long-term stable operation of the system. The unloading return circuit quickly guides liquid backflow when the pressure reaches the threshold, preventing overload, reducing energy consumption and extending equipment life, thereby improving the system's response speed, stability and control accuracy, and effectively enhancing the efficiency and reliability of the hydraulic system.

[0019] 2. This high-flow unloading valve structure based on pilot-driven adaptive control incorporates ceramic balls and guide sleeves. The ceramic balls utilize a line seal to engage with the pilot valve seat, increasing the contact area and reducing the impact of high-pressure fluid on the valve core. This prevents a sharp increase in stress on the sealing surface, thereby improving sealing reliability and system lifespan. During pressure changes, the push rod moves stably, with the spring guide rod providing reverse pressure to ensure reliable execution of the pilot valve's closing or unloading function. Furthermore, the ceramic ball guide sleeve ensures smooth movement of the ceramic balls, preventing deviation due to fluid impact, reducing pressure fluctuations, and improving control accuracy. The engagement of the adjusting sleeve and set screw allows the operator to precisely adjust the preload of the spring guide rod, flexibly responding to different operating conditions and ensuring precise adjustment of the valve opening pressure. This optimizes the stability, response speed, and control accuracy of the hydraulic system, extending the equipment's service life. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 is a schematic diagram of the unloading valve in operation of the present invention;

[0023] Figure 3 is a schematic diagram of the internal planar structure of the main valve body of the present invention;

[0024] Figure 4 is a schematic cross-sectional view of the main valve body of the present invention;

[0025] Figure 5 is a schematic diagram of the internal cross-sectional structure of the mechanical pilot valve of the present invention.

[0026] Figure 6 is an enlarged structural diagram of point I in Figure 5 of this invention.

[0027] The diagram is marked as follows:

[0028] 1. Main valve body; 2. Mechanical pilot valve; 3. Adjusting screw; 4. Solenoid pilot valve; 5. Mechanical / solenoid switching knob; 6. Pilot filter; 7. Main valve sleeve; 8. Main valve seat; 9. Main valve spring; 10. Main valve core; 11. Check valve spring; 12. Check valve core; 13. Check valve guide sleeve; 14. High-pressure supply channel; 15. Pump discharge channel; 16. Unloading return channel; 17. First high-pressure pipe; 18. Second high-pressure pipe; 19. Pilot valve plug; 20. Push rod; 21. Push rod guide sleeve; 22. Pilot valve seat; 23. First ceramic ball guide sleeve; 24. Adjusting screw sleeve; 25. Set screw; 26. Spring guide rod; 27. Second ceramic ball guide sleeve; 28. Third ceramic ball guide sleeve; 29. ​​Ceramic ball; 30. Third high-pressure pipe. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0030] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] As shown in Figures 1 to 6, the high-flow unloading valve structure based on pilot-driven adaptive control includes a main valve body 1. Two main valve seats 8 are located at the top of the main valve body 1, each with a main valve core 10. Two check valve guide sleeves 13 are located at the bottom of the main valve body 1, each with a check valve core 12. The check valve cores 12 are positioned below the main valve cores 10. A mechanical pilot valve 2 is located at one end of the main valve body 1 and communicates with the main valve cores 10 via a fluid channel. This mechanical pilot valve controls the opening and closing of the main valve cores 10 when the hydraulic system pressure increases. The mechanical pilot valve 2 is internally equipped with a pilot valve core; an electromagnetic pilot valve 4, which is located on the top side of the mechanical pilot valve 2 and is connected to the main valve core 10 through a fluid channel to adjust the state of the main valve core 10 under the control of an external electrical signal; and a pilot filter 6, which is located at the bottom side of the mechanical pilot valve 2. The pilot filter 6 is used to filter the high-pressure liquid entering the electromagnetic pilot valve 4 or the mechanical pilot valve 2 to ensure stable system operation. The top side of the electromagnetic pilot valve 4 is also equipped with a mechanical / electromagnetic switching knob 5, which is used to switch between mechanical control and electromagnetic control.

[0032] When the hydraulic system is running, high-pressure fluid enters the main valve body 1 and acts on both the mechanical pilot valve 2 and the solenoid pilot valve 4. When the hydraulic system needs to maintain pressure, the main valve core 10 remains closed under the control of the pilot valve core, and the fluid flows to the working port to ensure normal operation of the equipment. When the system reaches the set pressure limit, if in mechanical mode, the mechanical pilot valve 2 will respond to the pressure change, open the pilot channel, release the pressure on the upper part of the main valve core 10, and move the main valve core 10 upward to achieve unloading. If in solenoid mode, the solenoid pilot valve 4 is opened by external electrical signal control, directly changing the pressure state on the upper part of the main valve core 10, causing the main valve core 10 to open for unloading. The pilot filter 6 works continuously throughout the process, filtering impurities in the high-pressure fluid to ensure the stable operation of the electromagnetic and mechanical control systems. The mechanical / electromagnetic switching knob 5 allows selection of mechanical or electromagnetic mode to control the unloading process to adapt to different working requirements. The addition of the mechanical / electromagnetic switching knob 5 allows the system to switch between automatic and passive control, improving applicability and adapting to different working conditions.

[0033] As shown in Figures 1 and 4, two main valve springs 9 are provided at the top of the main valve body 1. The bottom ends of the two main valve springs 9 are fixedly connected to one side of the main valve core 10. Two one-way valve springs 11 are provided in the middle of the main valve body 1. The other ends of the two one-way valve springs 11 are respectively embedded in one side of the two one-way valve cores 12. Two main valve sleeves 7 that are adapted to the main valve core 10 are provided on the top surface of the main valve body 1.

[0034] When the hydraulic system is in a high-pressure supply state, the main valve spring 9 ensures that the main valve core 10 remains in the initial closed state. The high-pressure liquid enters the working port through the check valve core 12, and the check valve spring 11 provides additional sealing force to prevent backflow. When the system reaches the unloading condition, the pilot valve releases the high-pressure liquid on the upper part of the main valve core, which overcomes the reset force of the main valve spring 9. The main valve core 10 moves upward to open the unloading channel, and the liquid flows back to the return oil tank to achieve unloading. When the pressure drops below the set value, the main valve spring 9 pushes the main valve core 10 downward to re-close the supply channel, and the hydraulic system resumes the pressure supply state. Throughout the process, the main valve sleeve 7 ensures the smooth sliding of the main valve core 10, reduces friction, and improves response speed and system stability.

[0035] As shown in Figures 1, 5, and 6, the pilot valve core includes a pilot valve plug 19 disposed on one side of the mechanical pilot valve 2. A push rod guide sleeve 21 is disposed on one side of the pilot valve plug 19. A push rod 20 is slidably installed inside the push rod guide sleeve 21. A pilot valve seat 22 is disposed on one side of the push rod guide sleeve 21. A first ceramic ball guide sleeve 23 is disposed on one side of the pilot valve seat 22. A ceramic ball 29 is disposed inside the first ceramic ball guide sleeve 23. A spring guide rod 26 is disposed on the other side of the mechanical pilot valve 2. Second ceramic balls are disposed on the upper and lower sides of the spring guide rod 26. The guide sleeve 27, the inner side of the two second ceramic ball guide sleeves 27 is also provided with a third ceramic ball guide sleeve 28, the main valve body 1 is provided with an adjusting screw sleeve 24 on the side away from the pilot valve plug 19, the adjusting screw sleeve 24 is installed with a set screw 25 in the internal thread, one side of the set screw 25 abuts against the spring guide rod 26, the mechanical pilot valve 2 is also provided with an adjusting screw 3, one side of the set screw 25 is fixedly connected to the adjusting screw 3, one side of the adjusting screw 3 is set with an internal hexagon, the sealing method of the first ceramic ball guide sleeve 23 and the ceramic ball 29 is set as a line seal;

[0036] When the hydraulic system pressure rises, high-pressure liquid enters the mechanical pilot valve 2 and applies force through the pilot valve seat 22, keeping the ceramic ball 29 in a sealed state to prevent liquid leakage. At this time, the push rod 20 remains stable in the push rod 20 guide sleeve, and the spring guide rod 26 provides reverse pressure to ensure that the pilot valve is in the closed state. When the hydraulic system needs to be unloaded, the pressure change pushes the push rod 20 to move backward, causing the ceramic ball 29 to deviate from the sealed position. The high-pressure liquid enters the return channel through the first ceramic ball 29, causing the main valve core to lose its upper pressure-holding function, thereby opening the unloading valve and realizing system unloading. During this process, the cooperation between the set screw 25 and the adjusting sleeve 24 allows the operator to precisely adjust the preload of the spring guide rod 26, thereby adjusting the valve opening pressure to adapt to different working conditions.

[0037] Furthermore, both the ceramic ball 29 and the pilot valve seat 22 are sealed by line sealing. The spherical surface contacts the high-pressure fluid, which greatly increases the contact area and reduces the impact of the high-pressure fluid on the valve core. When the high-pressure fluid impacts and opens the ceramic ball 29, the high-pressure fluid passes along the spherical surface, and the contact area does not decrease, thus preventing a rapid increase in the stress on the sealing surface. The ceramic ball 29 moves smoothly through the ceramic ball 29 guide sleeve, which can maintain a small pressure fluctuation range under high pressure conditions and stabilize the pressure.

[0038] As shown in Figures 2 and 3, a high-pressure liquid supply channel 14, a pump discharge channel 15, and an unloading return channel 16 are also provided on one side of the main valve body 1. The high-pressure liquid supply channel 14 is located at the bottom inside the main valve body 1 and is set above the check valve. A high-pressure liquid supply port is provided on one side of the high-pressure liquid supply channel 14. The unloading return channel 16 is located at the top inside the main valve body 1. The unloading return channel 16 is connected to the two main valve cores 10. An unloading return port is provided on one side of the unloading return channel 16. The pump discharge channel 15 is set between the high-pressure liquid supply channel 14 and the unloading return channel 16. A pump discharge port is provided on one side of the pump discharge channel 15.

[0039] When the hydraulic system is in the fluid supply state, high-pressure fluid enters the main valve body 1 from the high-pressure fluid supply channel 14 and flows to the actuator through the main valve core 10, providing stable working pressure. When the system pressure reaches the set value, if unloading is required, the main valve core 10 opens under the pilot control, allowing the high-pressure fluid to flow into the unloading return port through the unloading return channel 16, thereby releasing pressure and ensuring system safety. After unloading is completed, the main valve core 10 resets, blocking the unloading return channel 16, and the system re-establishes pressure. At the same time, the pump discharge channel 15 ensures that the pump discharge fluid can flow smoothly into the main valve and further into the system, preventing fluid accumulation in the pump or fluid flow fluctuations from affecting the action of the main valve core, thus keeping the entire hydraulic circuit stable.

[0040] A first high-pressure pipe 17 is provided on one side of the high-pressure supply channel 14. The other end of the first high-pressure pipe 17 is connected to the pilot valve core inside the mechanical pilot valve 2, and the first high-pressure pipe 17 is located at the rear of the push rod 20. A second high-pressure pipe 18 is provided on one side of the pump discharge channel 15. The second high-pressure pipe 18 flows back to the pilot valve core after passing through the pilot filter 6 and is connected to the main valve core 10. The second high-pressure pipe 18 is first connected to the main valve core 10 through the main valve sleeve 7. A third high-pressure pipe 30 is provided on one side of the unloading return channel 16. The other end of the third high-pressure pipe 30 is connected to the rear of the pilot valve core. The diameters of the first high-pressure pipe 17, the second high-pressure pipe 18, and the third high-pressure pipe 30 are all set to 3mm.

[0041] When the hydraulic system is started, the high-pressure emulsion flows along the first fluid line (main fluid supply line) through the high-pressure fluid supply channel 14 and enters the working port through the check valve, providing stable pressure for the hydraulic support. This main fluid supply line is the core power source of the hydraulic system, ensuring the normal operation of the hydraulic actuators. At the same time, the check valve is used to prevent the high-pressure liquid from flowing back, improving the fluid supply efficiency and system stability.

[0042] Meanwhile, the second hydraulic circuit (the hydraulic circuit for controlling the action of the push rod 20) delivers high-pressure liquid to the mechanical pilot valve 2 through the first high-pressure pipe 17, and then enters the rear of the push rod 20 of the pilot valve core through a 3mm small hole, ensuring that the push rod 20 always applies force to the pilot valve core and keeps it in a balanced state. The advantage of this is that it can automatically maintain the pressure balance of the pilot valve core during system operation, prevent malfunctions or delayed responses caused by pressure fluctuations, and thus improve the control accuracy and stability of the entire hydraulic system.

[0043] When the system is under pressure, the third hydraulic circuit (pressure holding control hydraulic circuit) introduces the high-pressure liquid from the pump into the pilot valve core through the second high-pressure pipe 18, and then enters the upper part of the main valve core 10 through the main valve sleeve 7, forming a downward thrust to press the main valve core 10 against the main valve seat and keep the main valve closed. The advantage of this pressure holding control mechanism is that it ensures that the high-pressure state of the system can be maintained for a long time, avoids the accidental loss of hydraulic oil due to vibration or loosening of the main valve core 10, and ensures a rapid response when liquid supply is needed.

[0044] When the system enters the unloading phase, the fourth fluid path (unloading return fluid path) begins to function. Once the system pressure reaches the preset unloading threshold, the pilot valve opens, and the high-pressure fluid in the third high-pressure pipe 30 is guided to the unloading return fluid channel 16. This causes the pressure on the upper part of the main valve core 10 to drop rapidly, losing its pressure-holding function, and then it moves upward, opening the return channel so that excess high-pressure fluid flows directly back to the oil tank. The advantage of this design is that it can quickly respond to unloading demands, avoid high-pressure overload damage to the system, and allow the pump to enter a low-load operating state, improving energy efficiency and extending equipment life.

[0045] The entire workflow relies on the coordinated operation of four hydraulic circuits to achieve hydraulic system fluid supply, pressure maintenance, unloading, and pressure balance, ensuring the system's stability, response speed, and control accuracy under different operating conditions.

[0046] Therefore, when the external hydraulic support stops using the liquid, the liquid pressure in the pipeline system will rise immediately, the mechanical pilot valve 2 will open, the main valve will be unable to maintain the pressure, and the liquid will be directly returned to the liquid tank by the pump. The pump will maintain high pressure and continue to unload (as shown in state BB in Figure 2).

[0047] When the hydraulic support resumes using fluid or when the pressure drops due to system leakage, the mechanical pilot valve spool will close, the main valve will resume maintaining pressure, the main valve spool will move down until it is closed, and the high-pressure fluid will push open the check valve to resume supplying fluid to the system (as shown in state AA in Figure 2).

[0048] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0049] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-flow unloading valve structure based on pilot adaptive control, characterized in that, include: The main valve body (1) has two main valve seats (8) at its top interior, and each of the two main valve seats (8) is provided with a main valve core (10). The main valve body (1) has two one-way valve guide sleeves (13) at its bottom interior, and each of the two one-way valve guide sleeves (13) is provided with a one-way valve core (12). The one-way valve core (12) is located below the main valve core (10). Mechanical pilot valve (2), the mechanical pilot valve (2) is located at one end of the main valve body (1) and is connected to the main valve core (10) through a fluid channel, so as to control the opening and closing of the main valve core (10) when the hydraulic system pressure rises. The mechanical pilot valve (2) is provided with a pilot valve core inside. Electromagnetic pilot valve (4) is located on the top side of the mechanical pilot valve (2) and is connected to the main valve core (10) through a fluid channel to adjust the state of the main valve core (10) under the control of an external electrical signal. A pilot filter (6) is provided at the bottom of one side of the mechanical pilot valve (2). The pilot filter (6) is used to filter the high-pressure liquid entering the electromagnetic pilot valve (4) or the mechanical pilot valve (2) to ensure stable operation of the system.

2. The high-flow unloading valve structure based on pilot adaptive control according to claim 1, characterized in that, The main valve body (1) has two main valve springs (9) at its top interior. The bottom ends of the two main valve springs (9) are fixedly connected to one side of the main valve core (10). The main valve body (1) has two one-way valve springs (11) in its middle. The other ends of the two one-way valve springs (11) are respectively embedded in one side of the two one-way valve cores (12). The main valve body (1) has two main valve sleeves (7) that are adapted to the main valve cores (10) on its top surface.

3. The high-flow unloading valve structure based on pilot adaptive control according to claim 2, characterized in that, The main valve body (1) is also provided with a high-pressure liquid supply channel (14), a pump discharge channel (15), and an unloading return channel (16) on one side. The high-pressure liquid supply channel (14) is located at the bottom inside the main valve body (1) and is located above the one-way valve guide sleeve (13). A high-pressure liquid supply port is provided on one side of the high-pressure liquid supply channel (14). The unloading return channel (16) is located at the top inside the main valve body (1). The unloading return channel (16) is connected to the two main valve cores (10). An unloading return port is provided on one side of the unloading return channel (16). The pump discharge channel (15) is located between the high-pressure liquid supply channel (14) and the unloading return channel (16). A pump discharge port is provided on one side of the pump discharge channel (15).

4. The high-flow unloading valve structure based on pilot adaptive control according to claim 3, characterized in that, The pilot valve core includes a pilot valve plug (19) disposed on one side of the mechanical pilot valve (2). A push rod guide sleeve (21) is disposed on one side of the pilot valve plug (19). A push rod (20) is slidably installed inside the push rod guide sleeve (21). A pilot valve seat (22) is disposed on one side of the push rod guide sleeve (21). A first ceramic ball guide sleeve (23) is disposed on one side of the pilot valve seat (22). A ceramic ball (29) is disposed inside the first ceramic ball guide sleeve (23). A spring guide rod (26) is disposed on the other side of the mechanical pilot valve (2). The upper and lower sides of the spring guide rod (26) are also... A second ceramic ball guide sleeve (27) is provided, and a third ceramic ball guide sleeve (28) is also provided on the inner side of the two second ceramic ball guide sleeves (27). An adjusting screw sleeve (24) is provided on the side of the main valve body (1) away from the pilot valve plug (19). A set screw (25) is installed in the internal thread of the adjusting screw sleeve (24). One side of the set screw (25) abuts against the spring guide rod (26). An adjusting screw (3) is also provided on one side of the mechanical pilot valve (2). One side of the set screw (25) is fixedly connected to the adjusting screw (3). One side of the adjusting screw (3) is set as an internal hexagon.

5. The high-flow unloading valve structure based on pilot adaptive control according to claim 4, characterized in that, The sealing method of the first ceramic ball guide sleeve (23) and the ceramic ball (29) is set as a line seal.

6. The high-flow unloading valve structure based on pilot adaptive control according to claim 5, characterized in that, A first high-pressure pipe (17) is provided on one side of the high-pressure liquid supply channel (14). The other end of the first high-pressure pipe (17) is connected to the pilot valve core inside the mechanical pilot valve (2). The first high-pressure pipe (17) is located at the rear of the push rod (20).

7. The high-flow unloading valve structure based on pilot adaptive control according to claim 6, characterized in that, A second high-pressure pipe (18) is provided on one side of the pump discharge channel (15). The second high-pressure pipe (18) flows back to the pilot valve core through the pilot filter (6) and then connects to the main valve core (10). The second high-pressure pipe (18) first connects to the main valve core (10) through the main valve sleeve (7).

8. The high-flow unloading valve structure based on pilot adaptive control according to claim 7, characterized in that, A third high-pressure pipe (30) is provided on one side of the unloading return channel (16). The other end of the third high-pressure pipe (30) is connected to the rear of the pilot valve core. The diameters of the first high-pressure pipe (17), the second high-pressure pipe (18), and the third high-pressure pipe (30) are all set to 3 mm.

9. The high-flow unloading valve structure based on pilot adaptive control according to claim 8, characterized in that, The top side of the electromagnetic pilot valve (4) is also provided with a mechanical / electromagnetic switching knob (5), which is used to switch between mechanical control and electromagnetic control.

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